Datasheet

© 2010 Microchip Technology Inc. DS70135G-page 143
dsPIC30F4011/4012
20.7 A/D Conversion Speeds
The dsPIC30F 10-bit ADC specifications permit
a maximum 1 Msps sampling rate. Ta ble 2 0-1
summarizes the conversion speeds for the dsPIC30F
10-bit ADC and the required operating conditions.
TABLE 20-1: 10-BIT A/D CONVERSION RATE PARAMETERS
dsPIC30F 10-bit A/D Converter Conversion Rates
A/D
Speed
TAD
Minimum
Sampling
Time Min.
R
S Max. VDD Temperature A/D Channels Configuration
Up to
1 Msps
(1)
83.33 ns 12 TAD 500Ω 4.5V
to
5.5V
-40°C to +85°C
Up to
750
ksps
(1)
95.24 ns 2 TAD 500Ω 4.5V
to
5.5V
-40°C to +85°C
Up to
600
ksps
(1)
138.89 ns 12 TAD 500Ω 3.0V
to
5.5V
-40°C to +125°C
Up to
500 ksps
153.85 ns 1 T
AD 5.0 kΩ 4.5V
to
5.5V
-40°C to +125°C
Up to
300 ksps
256.41 ns 1 T
AD 5.0 kΩ 3.0V
to
5.5V
-40°C to +125°C
Note 1: External V
REF- and VREF+ pins must be used for correct operation. See Figure 20-2 for recommended
circuit.
VREF-VREF+
ADC
ANx
S/H
S/H
CH1, 2 or 3
CH0
VREF-VREF+
ADC
ANx
S/H
CH
X
VREF-VREF+
ADC
ANx
S/H
S/H
CH1, 2 or 3
CH0
VREF-VREF+
ADC
ANx
S/H
CH
X
ANx or VREF-
or
AV
SS
or
AV
DD
VREF-VREF+
ADC
ANx
S/H
CH
X
ANx or VREF-
or
AV
SS
or
AV
DD